+static void
+nouveau_perf_voltage(struct drm_device *dev, struct bit_entry *P,
+ struct nouveau_pm_level *perflvl)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nvbios *bios = &dev_priv->vbios;
+ u8 *vmap;
+ int id;
+
+ id = perflvl->volt_min;
+ perflvl->volt_min = 0;
+
+ /* boards using voltage table version <0x40 store the voltage
+ * level directly in the perflvl entry as a multiple of 10mV
+ */
+ if (dev_priv->engine.pm.voltage.version < 0x40) {
+ perflvl->volt_min = id * 10000;
+ perflvl->volt_max = perflvl->volt_min;
+ return;
+ }
+
+ /* on newer ones, the perflvl stores an index into yet another
+ * vbios table containing a min/max voltage value for the perflvl
+ */
+ if (P->version != 2 || P->length < 34) {
+ NV_DEBUG(dev, "where's our volt map table ptr? %d %d\n",
+ P->version, P->length);
+ return;
+ }
+
+ vmap = ROMPTR(bios, P->data[32]);
+ if (!vmap) {
+ NV_DEBUG(dev, "volt map table pointer invalid\n");
+ return;
+ }
+
+ if (id < vmap[3]) {
+ vmap += vmap[1] + (vmap[2] * id);
+ perflvl->volt_min = ROM32(vmap[0]);
+ perflvl->volt_max = ROM32(vmap[4]);
+ }
+}
+